I have a question, just recently bought a 1986 k20 plow truck. I have a 7 1/2 and a 8' blade both in equal (ok) shape. I am going to keep on and sandblast and paint it but not sure which one. What is the big deal 6" bigger? Which should I use? The truck doesn't have and front end sag issues with either but I am not sure I would even notice a difference between the two.